[1又2分之3减(1/3-1/6+5/12)x2.4]x5

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[1又2分之3减(1/3-1/6+5/12)x2.4]x5
[1又2分之3减(1/3-1/6+5/12)x2.4]x5

[1又2分之3减(1/3-1/6+5/12)x2.4]x5
一3